Toyota recommends 87 octane for use in my 4.0 V6 tacoma. Would 89 or 91 octane make the engine perform better or improve MPG??? The short answer seems to be "HELL NO", that is unless your engine has been modified to increase compresson.....such as installing a super charger. I see what seems to be quite a few people here that proclaim to "ONLY" use 91 octane in their Tacomas. I wonder why?
It pisses me off to pay $3.25 for a gallon of 87 octane fuel. I cannot understand paying more $$$ for absolutely no gain If any of you know something different, please enlighten me.

We may be beating a dead horse.... My 05' manual says 87 minimum, for improved power and fuel economy 91. I dont know if the 06,07, or 08 motors a have been mapped to like 87 octane better and if the the wording has changed in the manual.

For 3.5 years I've tried all grades for a time. I wish I couldn't tell the difference, but mine and runs rougher and pings on 87. Usually run half 93/87 for 90, in a hurry 89. If 18 gallons, $60 (87) vs $61.80 (90) is worth it to me.

Last year my father used my truck and filled it w/ 87, I could tell immeadiately. Thats me, if you dont notice, then save $ and run 87.

Sorry, but I didn't realize that I was beating a dead horse . I have only been a member of this forum for little less than a year. While I'm certainly not on it all the time, I do check in about once a week and typically read the first two pages of threads. I have seen several oil threads but not really one regarding octane preference. I certainly don't care what gas or oil anyone uses.